That’s a great question, Alexainie.
I’m not aware of any specific preferences of people with Autism in that regard. That’s not to say whether it exists.
One thing I have noticed is that most of my clients who are into advocacy prefer person-first. It could be due to the influence of my service organization’s philosophy and policies. Or, personal preference…
Also, those who would advocate for themselves in that way are far less likely to be on the Autism Spectrum. Clients with Cerebral Palsy or Down’s Syndrome are more capable, overall, of negotiating the social barriers experienced by all people with DD.
Again, these are my observations over 11 years. I’m sure there are others with more experience than me who might have different takes.